提起劳动争议仲裁的当事人应当自劳动争议发生之日起多长时间提起仲裁A．2年内 B．1年

阅读理解。

    If you have no special plans for your holidays, why not spend your time helping others?

    Don't listen to people who say the young people today often think only of themselves. It's not true at all.

More and more young people in the U.S.A. volunteer (志愿) to spend their school holidays working for others.

And they don't do it for money. Here are some of their stories.

    Alice Hamilton, 17

    I'm going to help the Forest Center build new hiking paths in the mountains. It's going to be terrific

(极好的)-I'll spend the whole summer living in the tent and breathing the clean mountain air. I'm going to

sleep under the stars. It will be a nice sport, and I'll be able to do something good at the same time.

    Jason Moore,18

    This summer, I'm going to volunteer with Special House Program. They build good, low-cost (低成本的)

houses and sell them to families that are not very rich. They'll teach me what to do, so I'll help people and also

have a chance to learn how to build houses.

    Trish Anderson,16

    I'm going to teach kids who have trouble in reading. I'll work for a program called Reading for Life. Every

day, I'm going to help kids choose and read books that they like. I want to be a teacher, and I love children

and reading, so this is going to be a great experience for me.

1. Young people in the U.S.A. volunteer to spend _____ helping others. [ ]

A. school holidays

B. weekdays

C. every morning

D. every afternoon

2. What does Alice volunteer to do in summer? [ ]

A. To sleep under the stars.

B. To breathe the clean mountain air.

C. To spend the whole summer living in the tent.

D. To help build new hiking paths in the mountains.

3. From the passage, we know that Jason Moore _____. [ ]

A. likes reading

B. is 18 years old

C. isn't very rich

D. is good at sport

4. _____ wants to be a teacher. [ ]

A. Alice Hamilton

B. Jason Moore

C. Trish Anderson

D. None of them

5. Which is the most possible title (标题) for this passage? [ ]

A. Reading for Life

B. A Special House Program

C. The Forest Center

D. Young American Volunteers

在房地产开发投资项目中，项目的财务内部收益率是使（）等于零的折现率。

A.项目的财务净现值

B.项目的财务净现值率

C.项目的利润率

D.项目的总投资收益率

黄铜是铜和锌的合金．向一定质量的黄铜样品中加入154.7g稀硫酸，恰好完全反应，产生0.2g氢气．

（1）求所用稀硫酸的溶质质量分数.

（2）除了可求出稀硫酸的溶质质量分数外，你还能求出的化学量有 _____ ．（填序号）

①锌的质量             ②铜的质量分数        ③锌的质量分数    

④硫酸锌的质量     ⑤硫酸溶液的体积    ⑥反应后溶液溶质质量分数．

按照营养级的次序，以长方形框的面积反映各营养级生物体的能量，从而构建的金字塔形营养结构又叫（）

A.生态金字塔

B.能量金字塔

C.数量金字塔

关于不同族烃类的BMCI值，下述说法不对的是（）

A、直链烷烃或分子结构接近直链烷烃的BMCI值接近于0；

B、异构烷烃的BMCI值高于直链烷烃；

C、对于带侧链的单环芳烃，侧链烷烃越大，BMCI值越小

D、单环芳烃侧链烷基的大小不影响BMCI值。